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KMID : 0361019920350050702
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Korean Journal of Otolaryngology - Head and Neck Surgery
1992 Volume.35 No. 5 p.702 ~ p.708
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Change of Bone Conduction Thredhold in Chronic Otitis Media
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Abstract
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It is unclear whether raised bone conduction threasholds in chronic otitis media are a reflection of cochlear damage, or Carhart effect, I.e. artificial elevation of bone conduction threshold due to conduction defect, or both
The purpose of this study is to discuss change of bone conduction thresholds in chonic otitis media. A total of 277 cases of unilateral chronic otitis media but without any other causes of sensorineural hearing loss were studied.
Mean preoperative bone conduction differences between diseased and normal contralateral ears were not statistically significant, ranging from 9.6dB to 11.9dB across the frequencies. Postoperative bone conduction thresholds were improved in 34.1%
of
cases of the successful tympanoplasty type I, ranging from 9.1dB to 13.1dB across the frequencies, 33.1% to 39.1% of the subjects across the frequencies had preoperative bone conduction differences greater than 15dB. The results suggest that the
bone
conduction threshold in chronic otitis media is influenced by Carhart effect and cochlear damage.
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